Thermal response test analysis for U-pipe vertical borehole heat exchangers under groundwater flow conditions

Magraner, Teresa; Montero, Álvaro; Cazorla-Marín, Antonio; Montagud, C.; Martos, Julio

doi:10.1016/j.renene.2020.11.029

Cited by 19 publications

(5 citation statements)

References 27 publications

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“…In-and outflowing groundwater in the borehole (advectiontransport of heat through fluid motion) has appeared to increase the effective thermal conductivity with TRT measurement time (Witte, 2007;Holmberg et al, 2018;Magraner et al, 2021). This result also occurs in model studies (Signorelli et al, 2007).…”

Section: Introductionmentioning

confidence: 69%

“…( 4) describes the physics well. This is an improvement to the work by Magraner et al (2021) where parameterization of the effective thermal conductivity had no physical meaning. Signorelli et al (2007) recommended that boreholes with groundwater flow should be modelled numerically as the impact of the groundwater flow was significant and the physics complex.…”

Section: Tablementioning

confidence: 83%

“…As an alternative to using an overall effective thermal conductivity, Hakala et al (2022) used depth specific values of the effective thermal conductivity, so that fractures with groundwater flow obtained own values. Magraner et al (2021) parameterized the effective thermal conductivity into one static part and one transient, groundwater affected part, thereby reducing the variation in effective thermal conductivity from 27 % to 1.4 %. Signorelli et al (2007) proposed to use the Peclet number to determine whether the effects of groundwater flow are significant.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Inclusion of Advection in Fractures in the Line Source Equation for Analysis of Thermal Response Tests

Kvalsvik

Holmberg²,

Ramstad

et al. 2023

Preprint

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Section: Introductionmentioning

confidence: 69%

Section: Tablementioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inclusion of Advection in Fractures in the Line Source Equation for Analysis of Thermal Response Tests

Kvalsvik

Holmberg²,

Ramstad

et al. 2023

Preprint

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“…Indeed, research illustrating how groundwater flow can influence mean fluid temperatures (Chiasson et al, 2000), thermal performances (Fan et al, 2007;Zanchini et al, 2012;Nguyen et al, 2017), geometrical layouts (Choi et al, 2013) or operation costs (Capozza et al, 2013;Samson et al, 2018) of these systems are numerous. The result of thermal response tests being also impacted by the advection of groundwater (Signorelli et al, 2007;Chiasson and O'Connell, 2011;Angelotti et al, 2014), much work has been devoted to parameters identification with various interpretation models (Raymond et al, 2011;Wagner et al, 2013;Antelmi et al, 2020;Magraner et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Analytic expressions for the moving infinite line source model

Pasquier¹,

Lamarche²

2022

Preprint

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Groundwater flow can have a significant impact on the thermal response of ground heat exchangers. The moving infinite line source model is thus widely used in practice as it considers both conductive and advective heat transfert processes. Solution of this model involves a relatively heavy numerical quadrature. Contrarily to the infinite line source model, there is currently no known first-order approximation that could be useful for many practical applications. In this paper, known analytical expressions of the Hantush well function and generalized incomplete gamma function are first revisited. A clear link between these functions and the moving infinite line source model is then established. Then, two new exact and integral-free analytical expressions are proposed, along with two new first-order approximations. The new analytical expressions proposed take the form of convergent power series involving no recursive evaluations. It is shown that relative errors less than 1% can be obtained with only a few summands. The convergence properties of the series, their accuracy and the validity domain of the first-order approximations are also presented and discussed.

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“…Refs. [44,45] demonstrated miniaturized wireless sensors (spherical probe), which used a thermal fluid inside the pipes of the borehole. The characteristics of the autonomous sensor were as follows: temperature range of 0-40 • C; resolution of < 0.05 • C; accuracy of ±0.05 • C; sampling interval of 0.1-25 s, and sampling capacity of 1000 samples.…”

mentioning

confidence: 99%

A Device to Register Temperature in Boreholes in Northwest Spain for Geothermal Research

Marcos-Robredo

Rey-Ronco

Castro-García

et al. 2022

Sensors

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This paper presents a device used to measure and register temperature for long-term subsoil measurements in boreholes. The borehole of this study is located in Gijón (Asturias, Spain). The measurements were made through two fixed sets of sensors coupled to the geothermal pipe, constituting two independent installations: (a) a commercial device called “Hobo”, which uses TMCx-HD-specific sensors based on resistors with variable resistance; and (b) a device built by this research group, which uses DS12B20 Maxim sensors, a bus 1-wire, and a recording device based on a conventional Arduino board. Temperature was registered every 5 min across several years. These measurements were used to thermally characterize the subsoil, determining the apparent thermal diffusivity, and to study the thermo-hydrogeology of the Lower Jurassic Gijón’s formation made of Liassic limestones and dolomites. This work is part of the Q-Thermie group’s research called “Shallow Thermal Energy”.

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Thermal response test analysis for U-pipe vertical borehole heat exchangers under groundwater flow conditions

Cited by 19 publications

References 27 publications

Inclusion of Advection in Fractures in the Line Source Equation for Analysis of Thermal Response Tests

Inclusion of Advection in Fractures in the Line Source Equation for Analysis of Thermal Response Tests

Analytic expressions for the moving infinite line source model

A Device to Register Temperature in Boreholes in Northwest Spain for Geothermal Research

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